Ventilating plate and spacer for electrical apparatus.



H. D. SUMMERS. 'VENTILATING PLATE AND SPACER FOR ELECTRICAL APPARATUS.

APPLICATION FILED OCT. 24,1906.

Patented Sept. 14, 1909.

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AT'TORNEY UNITED STATES PATENT OFFICE.

HARRY D. SUMMERS, OF WILKINSBURG, PENNSYLVANIA, ASSIGNOR TO WESTING- HOUSE ELECTRIC MANUFAOTURING COMPANY, A CORPORATION OF PENNSYL- VANIA.

VENTILATING PLATE AND SPACER FOR ELECTRICAL APPARATUS.

To all whom it may concern:

Belt known that I, HARRY D. SUMMERS, a citizen of the United States, and a resident. of lVilkinsburg, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in Ventilating Plates and Spacers for Electrical Apparatus, of which the followingis a specification.

My invention relates to the ventilation of electrical apparatus and has special reference to means for spacing and ventilating laminated magnetizable core structures.

The object of my invention is to provide a spacing or ventilating plate that shall be inexpensive and durable in construction and that shall embody improved means for attaching spacing members to the plate.

Laminated core structures for dynamoelectric machines and for other electrical ap paratus have often been provided with spacing or ventilating grids, or plates to which spacing blocks were attached. The cast grids of the prior art were relatively eX- pensive and occupied a considerable space because of the material, such as brass, or other composition of copper, of which they were made and they therefore materially interfered with the ventilation which they were intended to insure. Then a magnetizable plate similar to or slightly thicker than the laminae of which the core was constructed was adapted for ventilating pur poses, spacing blocks or fingers were usually attached to the surface of the plates by rivets or similar devices. This method was also expensive by reason of the labor and time involved in assembling the spacing structures. v

According to my present invention, I provide a spacing member comprising a magnetizable plate which is similar in outline to the adjacent plates of the laminated structure in which it is embodied and, by simple and improved means, I attach a plurality of similar spacing blocks or fingers which may readily be punched from relatively thin sheet metal.

One of the advantages of my improved structure lies in the fact that the spacing fingers may be so arranged as to interfere, to a minimum degree, with the circulation of air through the laminated structure and althougltjhey are punched from thin sheet metal aird agmbled 011 edge they show no Specification of Letters Patent.

Application filed October 24, 1906.

Patented Sept. 14:, 1909. Serial No. 340,264.

tendency to buckle when a consideraljile pressure is applied at right angles to the laminae.

In the accompanying drawings, Figure l is a front elevation of a portion of a spacing plate constructed in accordance with my iii- VGIItTOII. Fig. 2 is a sectional view of the plate shown in Fig. l, a spacing finger being shown slightly separated from the plate, and Fig. 3 is a similar view of the assembled structure. Fig. 4 is a view similar to Fig. 1, but showing several sets of fingers as they appear in the laminated core of a relatively large stationary armature.

Referring to the drawings, the ventilating or spacing member illustrated comprises a plate 1 which is adapted for use with substantially cylindrical laminated core structures of dynamo-electric machines, and a plurality of spacing blocks or fingers 2 which are attached thereto. The spacing fingers 2 com prise two substantially parallel straight portions 3 and a and an intermediate connecting portion 5, which forms obtuse angles with the parallel portions to which it joined. In the plane of the intermediate portion, and projecting therefrom, are two cars 6 which are adapted to project through oblong holes punched in the plate 1. The fingers are held in position on the plate, as shown in Fig 3, by upsetting the ends of the projections (3 against the back of the plate. The two parallel straight portions of the fingers are sufiiciently separated to give the fingers stability, and the intermediate portion forms obtuse angles with these parts so that it will interfere, to a minimum extent, with the circulation of air through the laminated structures, the fingers, in general. being assembled in the line of ventilating currents. In the core structures of dynamoelectric machines, the spacing fingers would obviously be assembled substantially in radial lines as shown in Fig. at of the drawings.

I desire that variations in size and a1- rangement which do not depart from the spirit of my invention shall be included within its scope.

I claim as my invention:

1. A ventilating or spacing member for laminated core structures of dynamo-electric machines comprising a segmental plate having a plurality of oblong holes therethrough. fingers or spacers disposed in approximately radial lines and severally consisting of two end portions disposed in approximately parallel planes and an intermediate connecting portion having a projection which eX- tends through one of the holes in the plate, all of said port-ions being in planes which are substantially perpendicular to the face of the plate.

2. Ventilating or spacing means for laminated structures comprising a plate, spacing strips or fingers each consisting of two end portions disposed in approximately parallel planes and an intermediate, relatively short connecting portion having ears which are in the same plane as the intermediate portion and project therefrom through a suitable hole in the plate, all of said finger portions being in planes which are substantially perpendicular to the face of the plate.

Witnesses:

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